“‘Stop. Stop. Stop, stop, stop,’ Caio says. He’s seen something. We’re on a side street in Rio de Janeiro — within walking distance of Maracanã Stadium, where Argentina is taking on Bosnia-Herzegovina in the first World Cup game the city is hosting — and a protest that had been marching on, compact and peaceful for the past hour, has just splintered. The packs of Rio police officers, who had been treading silently and steadily alongside the banner-waving protesters, suddenly formed a cordon. The tear gas quickly followed, sending the protesters helter-skelter. Now I follow Caio, a member of the independent media collective Mídia Ninja, a veteran of this kind of thing, out of the scrum. ‘It’s dangerous what they decide to do,” he says of the protesters. “The street is very small. There is no strategy.’” Grantland